Refuse-destructor.



H. N. LEASK.

REFUSE DESTRUGTOR.

I APPLIUATION FILED MAY 12, 1910. 1,085,445, Patented Jan. 2'7, 1914.

3 SHEETS-SHEET 2.

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WITNESSES. INVENTOR.

COLUMBIA PLANOGRAPH c0., WASHINGTON, n. c-.

H. N. LEASK.

REFUSE DESTRUGTOR. APPLICATION FILED MAY 12, 1910.

Patented J an. 27, 1914.

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"INVENTOR WlTNESSES COLUMBIA PLANOGRAPH c0.,\v/\5H|NGToN. n.c.

UNITED STATES PATEN T OFFIGE.

HENRY NORMAN LEASK, F EGREMON'I, ENGLAND.

REFUSE-DESTRUC'IOR.

Specification of Letters Patent;

Patented Jan. 27, 1914.

Application filed May 12, 1910. Serial No. 560,913.

To all whom it may concern:

Be it known that I, HENRY NORMAN LEASK, a British subject, residing at Egremont, county of Chester, England, have invented certain new and useful Improvements in Refuse-Destructors, of which the following is a specification.

This invention relates to improvements in the furnaces of refuse destructors and is designed to provide an improved construction of furnace which can be easily and expeditiously clinkered, and which presents other advantages over ordinary furnaces of the kind.

It consists essentially of a trough shaped grate formed with a hollow metal jacket through which air can be circulated and having openings in the grate through which air can be blown into the fire, the whole of the lower part of the outer portion of the jacket preferably being hinged so that it can be opened to allow any dust which may be collected to fall into the ashpit the grate being preferably made somewhat narrower at the back than at the front and inclined downward and having a. door the whole width of the furnace and being preferably provided with a bar or bars extending the length of the furnace, the inner end or ends of which projects or project upward and is or are provided with arms or the like so that when a charge is burnt out the door can be opened and the whole of the clinker in the grate can be expeditiously removed by drawing the bar forward in any suitable manner, the arms or the like thereon forcing the clinker out through the door of the grate in a mass.

The invention will be described with ref-' edges cool. Fig. 5. is a sectional side view of construction of drag bar for withdrawing the clinker. Fig. 6. is a transverse section of same.

In a simple form of the invention shown in Fig. 1, 2, and 3 of the drawings the grateconsists of a trough A the sides A A and the end of which are provided preferably with vertical ribs or gills a and an outer jacket or casing B extending outside the ribs nearly up to the top of the grate but leaving a space between the wall and the top of the jacket so that air can pass from the ashpit downward between the grate and the jacket and the ribs and through holes or openings a, provided for this purpose in the walls of the grate, to the fire. The lower portion 6 of the jacket B may be hinged as at a if desired and means for operating same from the front of the furnace to open them to allow any ash to drop into the ashpit may be provided such as the lever and link arrangement C, Z, Z Z shown in Figs. 3 and 5.

The grate may be constructed of separate side and end walls and with a separate bottom section a or in any other suitable manner according to circumstances. It may for instance be cast all in one piece and the ribs may be formed either integrally with the grate or the casing B or independently of both. Where employed the bottom section a may be perforated for the admission of air.

The grate is supported in the furnace in any convenient way. It may be built into and supported by the side walls, or it may be carried on cross girders M as shown or it may be supported by both these methods. It is preferable to support the grate mainly on girders as this allows for expansion and contraction due to variation in temperature and to facilitate this action rollers or balls them rolling off the girder and dropping into the ashpit.

' Two, three or more of the grates if desired may be arranged in one combustion chamber as is usual in refuse destructor practice. Fig. 4. shows two grates arranged in this manner. When so arranged suitable means are preferably provided for protecting the tops of the sides or walls of the grate to prevent them burning away. For this purpose ribs or gills a and the casing B are preferably so arranged that the air for the fire is introduced into the jacket at the top of the sides and is directed downward to the lower portion of the sides before it passes into the fire. This keeps the ridges or the tops of the sides of the grate A cool and prevents them burning away.

If desired a water chamber E may be arranged at the top of the edges, as shown by Fig. 4, and through which water is circulated in the ordinary way. This water chamber may act as an auxiliary boiler,

' water being supplied thereto by means of ordinary up and down circulation pipes c f as in the case of an ordinary household boiler.

As shown in Fig. 4;, the water chamber E may be divided longitudinally by a diaphragm or plate a to assist and increase the circulation, or the pipes c and f may otherwise be connected to the boiler in such a manner that circulation is maintained in them.

The edges of adjacent grates may be built into a fire brick wall or they may be bolted or otherwise secured together and supported upon the top of the ashpit wall see Fig. 4. This arrangement allows for expansion and also assists by conduction through the plate to keep the edges of the grates cool. Instead of a plate bolted between the edges of the grates one or both of the adjacent edges of two grates may themselves depend and be supported or dip into a water tank in the way mentioned.

In one form of the invention means may be provided for clinkering or discharging the grate consisting of a draw or push bar preferably adapted when a charge is burnt out to remove or discharge the whole of the residuum in the grate at one time. In one method of accomplishing this a longitudinal groove or recess is formed in the bottom of the grate, either in the jacketed portions or between them or in the central bar 0: in which fits a bar D which extends the full length of the furnace and is turned up at the inner end and provided with a plate cl, arms or the like adapted to press the charge out of the grate when the bar D is moved forward. Air is preferably admitted to the fire around the bar in such a way that the latter is kept cool and prevented from burning.

The door of the furnace is preferably made the full width of the front of the grate, and after a charge has been burnt therein the bar D is drawn forward in any suitable manner, as for instance by a small winch, and, by means of the plate 01 or the like arms attached thereto, the complete charge of clinker or other residuum in the grate is forced out through the door.

The end of the grate may be constructed in any convenient manner as above described. Where a draw bar D is employed it is preferable to keep it cool by any suitable means such as by air blown against it or through it.

If desired a recess a (see Fig. 5) may be made in the back of the furnace to receive the head d of the draw bar D. Where a drawbar D is employed an opening maybe made at the back end of the grate, closed by a damper or door K to receive any ashes or clinker that may be pushed back by the draw bar when this is being pushed into position in the grate after having been withdrawn. The damper or door may be operated in any suitable way from the front of the furnace.

Where a number of grates are arranged side by side in one unit as above described a single winch arranged to travel in front of the furnace may be employed to operate all I the drawbars.

In my copending application Serial No. 560,914, a trough-like grate surrounded by a jacket having doors to form air passages relatively to the grate, together with openings in the rate sides for the admission of air above tie bottom of the grate, is disclosed, and the same structure is embodied in the present application. In said application Serial No. 560,914 claims are drawn to cover the particular arrangement of the lower reduced extremity of the grate having an opening-extending longitudinally thereof and a supporting means applied under the grate, but the latter structure is not claimed in the present application, the claims of the present application being directed more particularly to the grate structure and the jacket with the doors and features of construction incidental thereto.

What I claim as my invention and desire to protect by Letters Patent is 1. In a refuse destructor or other furnace, a hollow grate of trough-like form having holes in the walls thereof and provided with a plurality of ribs on the outer portion, a jacket applied to the ribs and forming with the latter distinct air passages extending fully downwardly from the top to the bottom of the grate, the jacket surrounding the grate and open at its upper portion, air being admitted into the grate above the bottom thereof through the grate sides so that equal expansion takes place and danger of cracking the parts of the grate reduced to a minimum, the jacket also forming with the adjacent parts of the grate means for receiving ashes, and doors forming part of the jacket and by means of which the ashes may be removed from the side of the lower reduced portion of the grate. Y

2. In a refuse destructor orother furnace, a hollow grate of trough-like form'having holes in the walls thereof and provided with a plurality of ribs on the outer portion, the grate having a bottom section, a-jacket applied to the ribs and forming with the latter distinct air passages extending fully downwardly to and including the bottom section and upwardly to the top of the grate, the

jacket surrounding the grate and open at its upper portion, and a plurality of horizontally disposed cross girders beneath the grate and extending transversely of the furnace, the lower reduced portion of the grate having a movable association with the girders to compensate for expansion and contraction of the grate.

3. In a refuse destructor or other furnace, a hollow grate of trough-like form having openings in the Walls thereof and provided with a plurality of ribs on the outer portion, the grate having a bottom section, a jacket applied to the ribs and forming with the latter distinct air passages extending fully downwardly to and including the bottom section and upwardly to the top of the grate, the jacket surrounding the grate and open at its upper portion, and a water circulating chamber associated with the grate edge for cooling the latter.

In testimony whereof I have hereunto set my hand in presence of two subscribing wit-- nesses.

HENRY NORMAN LEASK. Witnesses:

I. OWDEN OBRmN, HARRY BARNFATHER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). C. 

